Welcome to the "R-help" mailing list

Yes, welcome, and please note the clear instructions for users in the
posting guide, to wit:  give an informative subject, and read the
necessary documentation first.

In your case, just accessing the "Packages" link in the navigation bar of 
the CRAN website would take you straight to the source package you are 
interested in. As the name suggests, source packages contain the source 
code for a package. The posting guide also suggests (firmly) that 
questions about packages should be addressed to their maintainers. 

As the maintainer of spdep, I may be able to respond to motivated 
questions off-list, but I doubt that your approach is going to be 
fruitful; there are usually better ways of doing things than writing C++, 
in fact writing R can be just as productive, and is much easier to debug.

I am trying to pass some R objects to C++ code. However, after reading
through the mannual "Writing R extensioms" for version 2.1.0
(2005-04-18),
I still couldn't figure out:

1) How can I see .c files in a package? For example, I am interested in
looking at source files in "Spdep".

2) Can I include whichever header files I find in my C++ code, if I
eventually will load the C++ code into R?

3) If yes to 2), where are header files of packages such as "Spdep"?

4) Any written code to handle matrices in this interface with C++?

Thanks

Xiaolei

______________________________________
Xiaolei Li

Department of Statistics
University of Wisconsin-Madison
1130A Medical Science Center
1300 University Avenue
Madison, WI 53706
USA

Office: (608)265-6217
Email: lxiaolei at stat.wisc.edu

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PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no